1539-04-4Relevant articles and documents
Fourier transform Raman spectroscopic study of main-chain thermotropic liquid crystalline polyesters
Ellis, G.,Lorente, J.,Marco, C.,Gomez, M. A.,Fatou, J. G.,Hendra, P. J.
, p. 1353 - 1366 (1991)
The Fourier transform infrared and Raman spectra of the semi-flexible main-chain thermotropic liquid crystal polyester, poly(heptamethylene terephthaloyl-bis-4-oxybenzoate) are presented, and tentative band assignments given.The polymer is investigated as a function of its thermal history, and Fourier transform Raman spectra are recorded with temperature using a high-temperature cell.The results are discussed along with calorimetric and X-ray scattering data.Spectral evidence is presented which is related to both the sample crystallinity, and the crystal-to-liquid crystal phase transition.
1. 4 - b (4 - hydroxybenzene acyl) rectifying section polyetherketoneetherketoneketone copolymer preparation method
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Paragraph 0022-0023, (2017/08/25)
The invention relates to a 1,4-dis(4-hydroxyl pyrazolyl)benzene and a preparation method of a polyetheretherketone copolymer, which belongs to the high-molecular material field. The method comprises the following steps: selecting nitrobenzene and tetrachloroethanes as solvents, taking aluminium trichloride as a catalyst for a Fries rearrangement reaction to obtain a 1,4-dis(4-hydroxyl pyrazolyl)benzene monomer, then adding 4,4'-difluorobenzophenone and sulfobenzide in a reaction container equipped with a thermometer, protecting under nitrogen, heating to 160-180 DEG C and adding carbonate, heating to 165-190 DEG C and adding a bisphenol monomer, wherein the bisphenol monomer is a mixture of hydroquinone and 1,4-dis(4-hydroxyl pyrazolyl)benzene, performing a program temperature control reaction to obtain a polymer, and processing to obtain the refined polyetheretherketone random polymer.
Molybdenum hexacarbonyl mediated alkoxycarbonylation of aryl halides
Ren, Wei,Emi,Yamane, Motoki
experimental part, p. 2303 - 2309 (2011/09/19)
Mo(CO)mediates the alkoxycarbonylation of aryl halides in their reaction with alcohols to afford arenecarboxylic acid esters. The molybdenum carbonyl complexes act as the catalyst and the source with carbon monoxide. The alkoxycarbonylation proceeds with a small excess of carbon monoxide in the form of Mo(CO)and the procedure is simple compared to the conventional method, which uses palladium catalyst under gaseous carbon monoxide. Using this procedure, a variety of carboxylic acid esters were prepared. Georg Thieme Verlag Stuttgart ? New York.
